# AD 82-21-03: Fire Detection

- Type: Airworthiness directive
- Status: Current
- Products: Mitsubishi Heavy Industries MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-30 and MU-2B-36
- Effective: October 14, 1982
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-4472
- Registered aircraft: 43 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BD5F2042E2DB7D3686256A4D0045A08C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/82-21-03

## The airworthiness directive

82-21-03 MITSUBISHI HEAVY INDUSTRIES, LTD., (MHI): Amendment 39-4472. Applies to MU-2B/-10/-15/-20/-25 (Serial Numbers 005 thru 238), MU-2B-30 (Serial Numbers 502 thru 547), and MU-2B-36 (Serial Number 501) airplanes certificated in any category. (This AD does not apply to MU-2B airplanes having serial numbers with the suffix "SA.")

COMPLIANCE: Required as indicated unless already accomplished.

To ensure correct engine fire detection and DC power emergency relay wiring, within the next 25 hours time-in-service after the effective date of this AD, accomplish the following: a) Inspect and, if necessary, repair the engine fire detecting and DC power emergency relay circuits as prescribed in Sections I and II of MHI Service Bulletin 187, dated May 27, 1982.

b) Aircraft may be flown in accordance with FAR 21.197 to a maintenance facility where this inspection can be accomplished.

c) An alternate means of compliance with this AD may be used when approved by the Manager,Honolulu Aircraft Certification Field Office, Northwest Mountain Region, Federal Aviation Administration, 300 Ala Moana Boulevard, Honolulu, Hawaii 96850.

This amendment becomes effective on October 14, 1982.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A2PC](https://openairdocs.org/tcds/A2PC): Mitsubishi Heavy Industries Ltd. 203; names 4 of 7 models: MU-2B, MU-2B-30, MU-2B-20, MU-2B-36

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 43 (43 by airframe model, 0 by engine model)
- Makers: Mitsubishi 43

Models with the most aircraft:

- [Mitsubishi MU-2B-25](https://openairdocs.org/model/mitsubishi-mu-2b-25): 23 aircraft (airframe model)
- [Mitsubishi MU-2B-20](https://openairdocs.org/model/mitsubishi-mu-2b-20): 12 aircraft (airframe model)
- [Mitsubishi MU-2B-36](https://openairdocs.org/model/mitsubishi-mu-2b-36): 7 aircraft (airframe model)
- [Mitsubishi MU-2B](https://openairdocs.org/model/mitsubishi-mu-2b): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/82-21-03/models.md
Every aircraft: https://openairdocs.org/ad/82-21-03/aircraft.md

Its text cites no advisory circulars or STCs.

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